The invention relates to the field of refining of hydrocarbon materials, and discloses a gasoline deep-desulfurization method and a gasoline deep-desulfurization device. The method comprises the following steps: (1) carrying out a pre-hydrogenation reaction on a gasoline raw material to obtain a pre-hydrogenated gasoline raw material; (2) fractionating the pre-hydrogenated gasoline raw material toobtain a light fraction and a heavy fraction; (3) contacting the light fraction with an extracting solvent to obtain a sulfur-containing solvent and a solvent-extracted light fraction, and separatingthe sulfur-containing solvent and sulfides in the sulfur-containing solvent to obtain a solvent-extracted sulfur-containing material and a sulfides-removed recovered solvent; (4) carrying out a selective hydrodesulfurization reaction on the heavy fraction to obtain a hydrogenated heavy fraction; and (5) mixing the hydrogenated heavy fraction with the solvent-extracted light fraction to obtain a gasoline product. The method allows the low-sulfur gasoline product to be obtained on the premise of avoiding great loss of the octane number.